JPS61151575A - Developing device - Google Patents

Developing device

Info

Publication number
JPS61151575A
JPS61151575A JP27325284A JP27325284A JPS61151575A JP S61151575 A JPS61151575 A JP S61151575A JP 27325284 A JP27325284 A JP 27325284A JP 27325284 A JP27325284 A JP 27325284A JP S61151575 A JPS61151575 A JP S61151575A
Authority
JP
Japan
Prior art keywords
developer
layer forming
forming member
blade
carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP27325284A
Other languages
Japanese (ja)
Inventor
Jiro Nagata
永田　二郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP27325284A priority Critical patent/JPS61151575A/en
Publication of JPS61151575A publication Critical patent/JPS61151575A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0812—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer regulating means, e.g. structure of doctor blade

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To electrify a developer enough to stick to a developer carrier by holding down both end parts of a developer layer forming member only in the contacting part between the developer carrier and the developer layer forming member and positions near this contacting part by a reinforcing member which is provided for pressing the developer layer forming member. CONSTITUTION:When a developing roll 20 is rotated in the direction of an arrow, a developer 14 stored in a developer hopper 16 is carried to the part surrounded with an electrifying blade 24 and the surface of the developing roll 20 through a developer supply hole 21. Since the developer 14 is pressed on the surface of the developing roll 20 in this part by the electrifying blade 24, a thin layer of the developer 14 is formed, and the developer 14 is triboelectrified in the pressing stage. The thin developer layer is carried to a position G close to a photosensitive drum 10 and faces the drum 10 which carries an electrostatic latent image on the surface, and the developer 14 is separated from the surface of the developing roll 20 and is field toward the photosensitive drum 10 in accordance with the intensity of the electric field formed by the electric charge of this latent image.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は、たとえば電子写真複写機に適用し得る現像装
置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a developing device applicable to, for example, an electrophotographic copying machine.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

非磁性−成分現像剤を用いた現像装置は、現像剤収納部
に収納されている現像剤を帯電させて、表面に静電潜像
を担持した像担持体へ現像剤を搬送する現像剤担持体の
表面に、現像剤を付着させ名。そしてこの現像剤を現像
剤担持体と像担持体との近接位置において、像担持体の
帯電箇所に付着して、像担持体に予め形成された静電潜
像を現像している。A developing device using a non-magnetic component developer charges the developer stored in a developer storage section and transports the developer to an image carrier carrying an electrostatic latent image on its surface. A developer is applied to the surface of the body. The developer is applied to a charged portion of the image carrier at a position close to the developer carrier and the image carrier to develop an electrostatic latent image previously formed on the image carrier.

このような現像装置の１つの問題点として、現像剤担持
体の両端部での現像剤の落下があげられる。現像剤収納
部から搬出されて現像剤層形成部材を通過した現像剤は
、この現像剤自身の帯電による鏡像力によって現像剤担
持体に付着している。そこで、現像剤担持体の中央部に
付着する現像剤の帯電が適当であるように現像剤層形成
部材の圧力を調整すると、現像剤層形成部材の両端部で
は圧力が弱くなる。そのため、現像剤収納部から搬出さ
れこの現像剤層形成部材の両端部を通過して来た現像剤
は、現像剤担持体に付着するには帯電が十分でないため
に、現像剤担持体の両端部において、現像剤の落下が生
じている。One problem with such a developing device is that the developer falls at both ends of the developer carrier. The developer carried out from the developer accommodating portion and passed through the developer layer forming member is attached to the developer carrier by the mirror image force due to the charging of the developer itself. Therefore, when the pressure of the developer layer forming member is adjusted so that the developer adhering to the center of the developer carrier is appropriately charged, the pressure becomes weaker at both ends of the developer layer forming member. Therefore, the developer that has been carried out from the developer storage section and has passed through both ends of this developer layer forming member is not sufficiently charged to adhere to the developer carrier. In some areas, developer has fallen.

そこで、この現像剤層形成部材の両端部での圧力不足を
解消させるために、従来においては、第３図及び第４図
に示したサイドブレード４０を設けたものが知られてい
る。Therefore, in order to eliminate the lack of pressure at both ends of the developer layer forming member, it is conventionally known to provide a side blade 40 as shown in FIGS. 3 and 4.

このサイドブレード４０は、現像剤層形成部材としての
帯電用ブレード４２に積層されて、帯電用ブレード４２
と同様にブレードホルダー４４によって支持されている
。そしてこのサイドブレード４０の両端に形成された突
出片４０ａ、４０ａにより帯電用ブレード４２の両端部
に圧力を余分にかけて、帯電用ブレード４２の両端部で
も現像剤担持体としての現像ローラ４６に強く圧接する
ことができるようになっている。しかしながらこの構造
によると、確かにサイドブレード４０の突出片４０ｍ、
４０ａで押さえられた帯電用ブレード４２の両端部から
出て来た現像剤の帯電不足による落下は解消されている
が、このサイドブレード４０の突出片４０ａ、４０ａか
ら外れた位置Ｂにおいて、逆に帯電用ブレード４２が現
像ローラ４６から浮き上がり、この位置から出て来た現
像剤が、帯電不足によって現像ローラ４６から落下して
しまうという欠点があった。This side blade 40 is laminated on the charging blade 42 as a developer layer forming member.
Similarly, it is supported by a blade holder 44. Then, extra pressure is applied to both ends of the charging blade 42 by the protruding pieces 40a, 40a formed at both ends of the side blade 40, so that both ends of the charging blade 42 are also strongly pressed against the developing roller 46 as a developer carrier. It is now possible to do so. However, according to this structure, it is true that the protruding piece 40m of the side blade 40,
The developer coming out from both ends of the charging blade 42 held down by the charging blade 40a has been prevented from falling due to insufficient charging, but at position B where it is removed from the projecting pieces 40a and 40a of the side blade 40, There was a drawback that the charging blade 42 rose from the developing roller 46 and the developer coming out from this position fell off the developing roller 46 due to insufficient charging.

〔発明の目的〕[Purpose of the invention]

本発明は上記事情にもとづいてなされたもので、現像剤
層形成部材の両端部やその近傍の位置を含めたすべての
面がほぼ均一な圧力で現像剤担持体に圧接させるように
して、現像剤層形成部材を通過したすべての現像剤が、
現像剤担持体に付着するに十分な帯電をすることができ
るような構造を具備した現像装置を提供することを目的
とする。The present invention has been made based on the above circumstances, and develops by bringing all surfaces of the developer layer forming member, including both ends and positions in the vicinity thereof, into contact with the developer carrier with approximately uniform pressure. All the developer that has passed through the agent layer forming member is
It is an object of the present invention to provide a developing device having a structure capable of sufficiently charging a developer to adhere to a developer carrier.

〔発明の概要〕[Summary of the invention]

本発明は上記目的を達成するために、電子写真複写機等
に適用し得る現像装置において、現像剤層形成部材の両
端部を現像剤担持体に強く圧接させるために設けられた
補強部材が、現像剤担持体と現像剤層形成部材との接触
部分及びその近傍の位置だけで、現像剤層形成部材の両
端部を押さえつけるような構造となっていること’ｔ−
％徴とするものである。To achieve the above object, the present invention provides a developing device that can be applied to an electrophotographic copying machine, etc., in which a reinforcing member is provided to force both ends of a developer layer forming member into strong pressure contact with a developer carrier. The structure is such that both ends of the developer layer forming member are pressed down only at the contact area between the developer carrier and the developer layer forming member and the position near the contact area.
It is expressed as a percentage.

〔発明の実施例〕[Embodiments of the invention]

以下本発明を第１図〜第２図に示す一実施例を参照しな
がら説明する。第１図は本発明の現像装置の構成を概略
的に示した断面図である。The present invention will be described below with reference to an embodiment shown in FIGS. 1 and 2. FIG. 1 is a sectional view schematically showing the structure of a developing device according to the present invention.

この図に示したように、表■に静電潜像を担持した像担
持体としての感光体ドラム１０と現像装置１２は、両者
の近接位置Ｇにおいて微少な間隔金保って配置されてい
る。As shown in this figure, the photosensitive drum 10, which serves as an image carrier carrying an electrostatic latent image on the front side (2), and the developing device 12 are arranged at a position G in close proximity to each other with a slight distance between them.

現像装置１２には、現像剤１４ｔ−収納している現像剤
収納部としての現像剤ホッパ１６と、現像剤１４ｔ−感
光体ドラム１０に搬送する現像剤担持体としての現像ロ
ーラ２０が配置されている。現像剤ホッパ１６は、ケー
シング１８によってＩ構成されている。この現像剤ホッ
パ１６内には、攪拌部材１９が回転可能に配置され、現
像剤１４の攪拌に供するようになっている。The developing device 12 is provided with a developer hopper 16 as a developer storage section that stores the developer 14t, and a developing roller 20 as a developer carrier that conveys the developer 14t to the photosensitive drum 10. There is. The developer hopper 16 is configured by a casing 18. A stirring member 19 is rotatably disposed within the developer hopper 16 and serves to stir the developer 14 .

現像ローラ２０は現像剤ホッパ１６の現像剤供給口２１
に対向して配置され、図示の方向に回転する。現像剤供
給口２１の開口上級部には、現像ローラ２０に圧接され
た状態でブレードホルダー２２によって支持された帯電
用ブレード２４が設けられている。The developing roller 20 is connected to the developer supply port 21 of the developer hopper 16.
and rotate in the direction shown. A charging blade 24 supported by a blade holder 22 in pressure contact with the developing roller 20 is provided at the upper part of the opening of the developer supply port 21 .

一方、帯電用ブレード２４の両端部を現像ローラ２０に
強く圧接させるように補強部材としてのサイドブレード
２６が設けられている。このサイドブレード２６は、第
２図の本発明の構成の要部を概略的に示した斜視図に示
すように、両端に突出して設けられた突出片２６ａ、２
６ａを有し、この突出片２６ａ、２６ａの先端には現像
ローラ２０と帯電用ブレード２４との接触部分Ａでのみ
帯電用ブレード２４の両端部を線接触状態で現像ローラ
２０に強く押さえつけるように折曲部２６ｂ、２６ｂｔ
−形成している。On the other hand, side blades 26 are provided as reinforcing members so that both ends of the charging blade 24 are brought into strong pressure contact with the developing roller 20. This side blade 26 has projecting pieces 26a and 2 provided at both ends, as shown in the perspective view schematically showing the main part of the configuration of the present invention in FIG.
6a, and at the tips of the protruding pieces 26a, 26a, there are provided such that the both ends of the charging blade 24 are strongly pressed against the developing roller 20 in a line contact state only at the contact area A between the developing roller 20 and the charging blade 24. Bent portions 26b, 26bt
-forming.

なお、このサイドブレード２６は帯電用プレー汝 ド２４ｔ−保持するブレードホルダー２２ａｔ−間に介
してブレードホルダー２２ｂでケーシング１８に固着さ
れている。The side blade 26 is fixed to the casing 18 by a blade holder 22b via a charging plate 24t and a holding blade holder 22at.

また、シール部材としてのサイドシール２８は、現像ロ
ーラ２０の回転表面に接触するようにケーシング１８の
側壁に取付けられている。Further, a side seal 28 as a sealing member is attached to the side wall of the casing 18 so as to contact the rotating surface of the developing roller 20.

上述した現像装置は、非磁性−成分現像剤を使用するも
のである。The development apparatus described above uses a non-magnetic-component developer.

すなわち、現像剤１４は熱可塑性樹脂にカーボンなどの
顔料を混練してなるもので、摩擦により、感光体ドラム
１０の帯電極性とは逆極性に帯電する高抵抗の非磁性ト
ナーである。That is, the developer 14 is made by kneading a pigment such as carbon into a thermoplastic resin, and is a high-resistance nonmagnetic toner that is charged to a polarity opposite to that of the photoreceptor drum 10 due to friction.

現像ローラ２０はアルミニウム製円筒体で、表面に現像
剤１４の薄層を担持して回転する。The developing roller 20 is a cylindrical body made of aluminum, and rotates while supporting a thin layer of the developer 14 on its surface.

現像ローラ２０と感光体ドラム１０とは微小間隔を保っ
て対向配置されている。現像ローラ２０が図示の方向に
回転すると、現像剤ホッパ１６内に収納されている現像
剤１４が、現像剤供給口２１を介して帯電用ブレード２
４と現像ローラ２０の表面とによって囲まれた部分まで
搬送される。ここで、現像剤１４が帯電用ブレード２４
によって現像ローラ２０の表面に押圧されるので、現像
剤１４の薄層が形成されるとともに、その押圧過程で摩
擦帯電される。The developing roller 20 and the photosensitive drum 10 are placed opposite each other with a small distance therebetween. When the developing roller 20 rotates in the illustrated direction, the developer 14 stored in the developer hopper 16 is delivered to the charging blade 2 through the developer supply port 21.
4 and the surface of the developing roller 20. Here, the developer 14 is transferred to the charging blade 24.
Since the developer 14 is pressed against the surface of the developing roller 20, a thin layer of the developer 14 is formed and is triboelectrically charged during the pressing process.

現像剤１４の薄層は、現像ローラ２０の回転に伴って近
接位置Ｇに搬送される。この位置Ｇにおいて、表面に静
電潜像を担持した感光体ドラム１０と対向するので、こ
の潜像の電荷によって形成される電界の強さに応じて、
現像剤１４が、現像ローラ２０の表面から離脱し、感光
体ドラム１０に向って飛翔する。この飛翔した現像剤１
４は感光体ドラム１０の帯電部分に付着し、現像が行な
われる。The thin layer of developer 14 is conveyed to a proximal position G as the developing roller 20 rotates. At this position G, it faces the photosensitive drum 10 carrying an electrostatic latent image on its surface, so depending on the strength of the electric field formed by the charge of this latent image,
The developer 14 separates from the surface of the developing roller 20 and flies toward the photosensitive drum 10. This flying developer 1
4 adheres to the charged portion of the photoreceptor drum 10, and development is performed.

サイドシール２８は、テフロンフェルトなどのフェルト
状部材若しくはウレタンスポンジなどのスポンジ状部材
から成るもので、現像ローラ２０に付着している現像剤
１４が、現像剤ホッパ１６を形成するケーシング１８の
側壁の外側に漏れるのを防止している。The side seal 28 is made of a felt-like member such as Teflon felt or a sponge-like member such as urethane sponge. Prevents leakage to the outside.

以上述べたように、この現像装置１２には、帯電ブレー
ド２４の両端部かつこの帯電用ブレード２４が現像ロー
ラ２０に接触する部分Ａの位置にサイドブレード２６の
折曲部２６ｂ、２６ｂが線接触するように対向して、こ
の帯電用ブレード２４全現像ローラ２０に強く押しつけ
ている。As described above, in this developing device 12, the bent portions 26b, 26b of the side blade 26 are in line contact with each other at both ends of the charging blade 24 and at the position A where the charging blade 24 contacts the developing roller 20. The charging blades 24 are all strongly pressed against the developing roller 20 so as to face each other.

したがって、帯電用ブレード２４の両端部の圧力不足金
解消するとともに、サイドブレード２６と帯電用ブレー
ド２４とが接触している部分が非常に小さいために、こ
のサイドブレード外れた位置Ｂにシいても、帯電用ブレ
ード２４の圧力が一様であるという効果がある。Therefore, the lack of pressure at both ends of the charging blade 24 is eliminated, and since the contact area between the side blade 26 and the charging blade 24 is very small, even if the side blade is placed at position B where it is out of place. This has the effect that the pressure of the charging blade 24 is uniform.

〔発明の効果〕 以上説明したように本発明によれば、現像剤層形成部材
の両端部を現像剤担持体に強く圧接させるように設けら
れた補強部材の圧力によって、現像剤層形成部材が変形
や歪をおこすことがない。したがって、現像剤層形成部
材のすべての位置において、はぼ均一の圧力で現像剤担
持体に圧接することができるので、現像剤担持体の両端
部やその近傍において、帯電不足による現像剤担持体か
らの現像剤の落下を防止することができるという効果が
ある。[Effects of the Invention] As explained above, according to the present invention, the developer layer forming member is pressed by the pressure of the reinforcing member provided so that both ends of the developer layer forming member are brought into strong pressure contact with the developer carrier. No deformation or distortion occurs. Therefore, all positions of the developer layer forming member can be brought into contact with the developer carrier with a nearly uniform pressure. This has the effect of preventing the developer from falling.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例の現像装置全概略的に示した
断面図、第２図は第１図に示した現像装置の要部を概略
的に示した斜視図、第３図は従来の現像装置の要部を概
略的に示した正面図、第４図は従来の現像装置の要部を
概略的に示した斜視図である。 １０・・・感光体ドラム　１２・・・現像装置　１４・
・・現像剤　１６・・・現像剤ホッパ　２０・・・現像
ローラ　２２・・・ブレードホルダー　２４・・・帯電
用ブレード　２６・・・サイドブレード　２６ａ・・・
サイドブレード突出片　２６ｂ・・・サイドブレード折
曲部 代理人　弁理士　則　近　憲　佑 （ほか１名） 第　　１　　図 Ｉ？ 第２図 第３図 桑４図FIG. 1 is a sectional view schematically showing the entire developing device according to an embodiment of the present invention, FIG. 2 is a perspective view schematically showing the main parts of the developing device shown in FIG. 1, and FIG. FIG. 4 is a front view schematically showing the main parts of a conventional developing device, and FIG. 4 is a perspective view schematically showing the main parts of the conventional developing device. 10... Photosensitive drum 12... Developing device 14.
...Developer 16...Developer hopper 20...Developing roller 22...Blade holder 24...Charging blade 26...Side blade 26a...
Side blade protruding piece 26b... Side blade bending section agent Patent attorney Noriyuki Chika (and one other person) Figure 1 I? Figure 2 Figure 3 Mulberry Figure 4

Claims (1)

【特許請求の範囲】 現像剤が収納されている現像剤収納部と、 表面に静電潜像を担持した像担持体へ前記現像剤を搬送
する現像剤担持体と、 この現像剤担持体に前記現像剤を付着せしめるように前
記現像剤担持体に圧接して設けられた現像剤層形成部材
と、 この現像剤層形成部材の両端部を前記現 像剤担持体と前記現像剤層形成部材との接触部分のみを
押さえつけるように設けられた補強部材とを具備したこ
とを特徴とする現像装置。[Scope of Claims] A developer storage section in which a developer is stored; a developer carrier that conveys the developer to an image carrier carrying an electrostatic latent image on its surface; a developer layer forming member provided in pressure contact with the developer carrier so that the developer adheres; and both ends of the developer layer forming member being connected to the developer carrier and the developer layer forming member. A developing device comprising: a reinforcing member provided to press down only a contact portion of the developing device.
JP27325284A 1984-12-26 1984-12-26 Developing device Pending JPS61151575A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27325284A JPS61151575A (en) 1984-12-26 1984-12-26 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27325284A JPS61151575A (en) 1984-12-26 1984-12-26 Developing device

Publications (1)

Publication Number Publication Date
JPS61151575A true JPS61151575A (en) 1986-07-10

Family

ID=17525238

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27325284A Pending JPS61151575A (en) 1984-12-26 1984-12-26 Developing device

Country Status (1)

Country Link
JP (1) JPS61151575A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS642260U (en) * 1987-06-24 1989-01-09
JPH08194373A (en) * 1995-01-13 1996-07-30 Nec Corp Developing device for electrophotographic device
JP2012053112A (en) * 2010-08-31 2012-03-15 Brother Ind Ltd Developing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS642260U (en) * 1987-06-24 1989-01-09
JPH0546031Y2 (en) * 1987-06-24 1993-12-01
JPH08194373A (en) * 1995-01-13 1996-07-30 Nec Corp Developing device for electrophotographic device
JP2012053112A (en) * 2010-08-31 2012-03-15 Brother Ind Ltd Developing device

Similar Documents

Publication Publication Date Title
US4745429A (en) Developing apparatus for an electrostatic photocopier
US5016560A (en) Device for image toner distribution on a developing device
JPS61129664A (en) Developing device
JPS61151575A (en) Developing device
JP2001100493A (en) Image forming device and processing cartridge
JPS61137173A (en) Developing device
US5140373A (en) Electrostatic latent image developing apparatus with bristle height adjusting member
JP2999590B2 (en) Developing device
JP3682495B2 (en) Development device
JPS6095562A (en) Developing device
JPH0641258Y2 (en) Development device
JPS5921035B2 (en) Electrostatic latent image developing device
JPH0194366A (en) Developing device
JP2598199B2 (en) Developing device
JPH08220964A (en) Electrophotographic device
JPH06337583A (en) Image forming device
JPS62115482A (en) Developing device
JP2547452Y2 (en) Developing device
JPS6311972A (en) Developing device
JPH0254288A (en) Image forming device
JP2535226Y2 (en) Toner developing device
JPH0223379A (en) Nonmagnetic single-component developing device
JPS63202770A (en) Developing device
JPH0869172A (en) Developing device
JPS61121071A (en) Developing device